Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Collaboration revenue	$ 13,266	$ 7,204	$ 38,548	$ 20,199
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 96,651	$ 60,486	$ 319,945	$ 158,646
General and administrative	22,145	18,711	66,680	48,988
Total operating expenses	118,796	79,197	386,625	207,634
Operating loss	(105,530)	(71,993)	(348,077)	(187,435)
Other (expense) income, net:
Interest income	1,945	349	3,188	780
Loss from equity method investment	(1,834)	0	(7,831)	0
Change in fair value of contingent consideration	(7,810)	0	(8,059)	0
Total other (expense) income, net	(7,699)	349	(12,702)	780
Net loss	$ (113,229)	$ (71,644)	$ (360,779)	$ (186,655)
Net Loss Per Share, Basic	$ (1.49)	$ (0.97)	$ (4.78)	$ (2.68)
Net Loss Per Share, Diluted	$ (1.49)	$ (0.97)	$ (4.78)	$ (2.68)
Weighted average shares outstanding, basic	76,047	73,706	75,543	69,720
Weighted average shares outstanding, diluted	76,047	73,706	75,543	69,720
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	$ 991	$ (161)	$ (5,069)	$ (175)
Other comprehensive loss from equity method investment	(805)	0	(1,667)	0
Comprehensive loss	$ (113,043)	$ (71,805)	$ (367,515)	$ (186,830)